Category: Administration / Server

with virt-manager, it is a breeze to select the PCI device (in this case enp3s0 NIC) for pass through to guest vm, in case the vm shall get it’s very own dedicated nic: notice: the passed NIC dissapears from the […]

one neat function of find, it that what it found can be passed to another function for further processing. or: it can delete the file BUT this can go horribly wrong (and it does not ask for confirmation) … deleting […]

this is a sample-example apt sources.list, because the perfect sources.list it is science for itself 🙂 (this is not an perfect sources.list but one that was tested and works) right now not including non-free would mean lenovo laptop users can […]

inxi – Command line system information script for console and IRC DESCRIPTION It is also used a debugging tool for forum technical support to quickly ascertain users’ system configurations and hardware. inxi shows system hardware, CPU, drivers, Xorg, Desktop, Kernel, […]

and: is the EU / Germany location simply unattractive for many companies in view of the data protection craze? “In the end, it may be bitter for Quad9 that they only got into the trouble by moving to Europe, where […]

the positive vision (always start with something positive) if big data about every keystroke every step we make (the police: every step you make) algorithms determine how mankind will live and thus: technology is “neutral” until it is used for […]

it is actually like this, in virt-manager, that chipset and bios can only be changed during first setup “begin installation” it then is fixed and can not be changed in virt-manager

the most fundamental networking settings are ever changing it used to be /etc/resolv.conf where nameservers are set systemd is doing it’s own thing /etc/systemd/resolved.conf and Ubuntu (based on Debian) is doing (again) it’s entirely own thing (netplan) frankly: this sucks […]

nfs is to GNU-Linux what smb is to Windows: sharing dirs & files “The Network File System (NFS) was developed to allow machines to mount a disk partition on a remote machine as if it were a local disk. It […]

remember that discussion about ever changing non-standard ways of defining network interfaces and ip addresses under /etc/network… well guess what, canonical just came up with a completely new config file format X-D (guess, everything is a yaml.yml now) hostnamectl; # […]

raid10 combines the speed of raid0 with the resilience of raid1. watch out: shingled hdd are not good for RAID! setup of GNU Linux mdadm software RAID10 is actually pretty straight forward: no need to do any partitioning. # tested […]

first off the praise: kvm-qemu is a high performance nicely scriptable virtualization system if it works, it can do pretty things 🙂 especially like the x11 forwarded virt-manager gui over ssh (yes it is a bit slow… but simplicity at […]

intro: would the user pay 100€ per month for a super fast uplink (in this case Starlink, x>150MBit/sec!!! (it (of course) fluctuates, also there is a BATTLE going on between SpaecX (StarLink) & Amazon (Project Kuiper) which hopefully does not […]

thanks to this excellent script it is now possible to nat-port forward multiple ports from: [internet]<->port:host<->vm thanks & great work all invovled 🙂 here is the script: etc_libvirt_hooks_qemu.txt (and here an older backup of the same) in NAT mode, the […]

update: 2021-08 can NOT recommend TL-WA901ND <-bridge-with-ap-mode-> TL-WA901ND, get frequent disconnects/reconnects (every ~20min for 30sec? it also might be to bad signal-receipten or something disturbing the signal at that rate) to extend StarLink WIFI and older tp-link + external antenna […]

hostnamectl; # tested on Static hostname: lenovo Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 # with virsh –version 5.0.0 libvirtd –version libvirtd (libvirt) 5.0.0 /usr/bin/kvm –version QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8+deb10u8) Copyright (c) 2003-2018 Fabrice […]

tested on host # debian 10 this option is only available in the gui on newer versions of virsh-manager to create a thin provisioned harddisk of capacity of 32GB image via bash-terminal go: qemu-img create -f qcow2 name-of-harddisk-image.qcow2 32G as […]

hostnamectl; # tested on Static hostname: giada Icon name: computer-desktop Chassis: desktop Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 su – root apt update # will install Java Web Start and openjdk-11-jre apt install icedtea-netx java-common […]

every user want’s a fast & responsive internet. BIND and DNS – the Phonebook of the internet – Berkeley Internet Name Domain – how to benchmark dns servers (find fastest) – LibreDNS There is nothing more anoying than slow loading […]

CentOS 7 (maintained until 2024) is hailed a rock-solid GNU Linux Open Source (?) server OS, hardened by many idelaistic developers & RedHat technicians. …and indeed it performed well on it’s xfs filesystem (thanks all involved also thanks to RedHat […]

harddisk encryption is important from critical data to get physically stolen (can’t do much about data that get’s stolen while DEcrypted) (except: to not have any physical network connection while the data is in DEcrypted state?) hostnamectl; # tested on […]

How to created multiple Wifi AccessPoints connecting (WDS Wifi Bridge) to one central Internet-Wifi-AccessPoint – Difference between TL-WA901N and TL-WA901ND where the Chinese and especially TP-Link and Huawai are very strong is data over radio (4G/LTE/5G/Wifi…) especially the TP-Link products […]

the error message basically means: the VM’s screen can not be auto-resized because the VBoxGuestAdditions kernel module drivers software was not properly build & installed. the solution: rebuild & reinstall the VBoxGuestAdditions (kernel module) properly: hostnamectl; # tested on guest […]

so RedHat developed the virsh manager, but not qemu itself. https://stackoverflow.com/questions/43704856/what-are-the-differences-between-qemu-and-virtualbox QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an […]

scroll down to ENGLISH “Zehntausende Mail-Server wegen Exchange-Lücke gehackt.  Wegen einer vor wenigen Tagen bekanntgewordenen Sicherheitslücke sind laut US-Medienberichten Zehntausende E-Mail-Server von Unternehmen, Behörden und Bildungseinrichtungen Opfer von Hacker-Attacken geworden. “Deutsche Unternehmen sind im internationalen Vergleich besonders stark von dieser […]

SecurityLab, [22.12.20 10:00] Google has explained the reasons for the massive failure of its services that took place last week. Recall that on December 14 of this year, users around the world for 47 minutes could not access Gmail, YouTube […]

for even better overview, it is possible to label harddisks & partitions like this: # this can be done on mounted ext4 / ext3 / ext2 partitions # swap partitions can not be labeled tune2fs -L “LABEL” /dev/sdaX # with […]

… because one also cares about beauty… a default avatar picture is not an option… but phpBB has a very strict 6KBytes max file size limit for Profile Avatar Pictures…  which is almost impossible to reach with format.jpg or format.png […]

not sure if the news rang through… the Amazon Cloud (AWS) guy will be the new CEO of Amazon. What cloud? Amazon “cloud” Hetzner “cloud” cloud (centralized digital infrastructure) can be designed / implemented in different ways. from: the user/admin […]

some gui programs like gparted (very nice harddisk partitioning program) won’t start as root. hostnamectl; # tested on Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-13-amd64 Architecture: x86-64 su – root; # become root gvim; # fails with E233: […]